Hi,

While we are discussing towers, there are many masts that are mis-tagged as 
towers. This is typically with mobile phone masts and similar.


A man_made=tower is a building and has (normally internal) floor space, albeit 
sometimes very modest https://wiki.openstreetmap.org/wiki/Tag:man_made=tower


A man_made=mast is not a building and does not have *internal* floor space, 
although some may have a deck. 
https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dmast


Some related tags like tower:type and tower:construction are shared between 
towers and masts.


Note that some vents for mines and railway tunnels can be easily misidentified 
as stub round towers, e.g. take a look at these on Bing.


https://www.openstreetmap.org/node/5126260873#map=19/52.75258/-7.69826
https://www.openstreetmap.org/node/1680956627#map=19/51.90450/-8.46172


/teaching people how to suck lemons. :)


Colm


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